Short answer
Fake IW329071 watches exist. They come from a small group of replica factories in Guangzhou and are sold as "1:1" or "super clone" copies. Quality runs from poor to close. The dial is not the main tell. The tells are the movement, the caseback engraving and the bezel action.
What the reference is
IWC uses the IW3290xx block for the Aquatimer Automatic line. The IW329071 sits in that family: steel case, 42 mm, dive bezel, sapphire crystal, rubber or steel bracelet option. Reference codes change with dial color and strap variant, so a mismatch on those two points is not proof of a fake. Confirm the dial and strap code on IWC's own reference page before you compare a watch to dealer photos.
Where replicas fail
Movement
A genuine IW329071 runs an IWC calibre with a long power reserve. Replicas use a third-party automatic: a Miyota copy, a Seagull, or an ETA clone. The caseback is solid, so you cannot see the movement. Ask for a timed power-reserve test instead. Compare the result to the figure IWC publishes for this reference. A watch that stops near 40 hours is not running an IWC calibre.
Case and bezel
Case thickness is the common error. Replica cases run thick at the mid-case and the lugs. Measure with calipers at the 9 to 3 line and across the lugs. Turn the bezel. A replica bezel feels soft or shows play at the 12 position. A genuine bezel indexes with a firm step at each marker.
Dial and hands
Look at the applied index edges under 10x magnification. Replica print shows rounded corners and uneven lume fill. Lume color varies by batch on replicas, so compare against a known genuine example, not stock photos. Check the minute hand tip against the chapter ring. Replica hands run short or sit high.
Caseback
Engraving depth is the strongest photo tell. Genuine casebacks carry crisp edges and even depth. Replicas show shallow, rounded letters and misaligned numbers. The reference and serial sit in fixed positions on the caseback. Ask the seller for a photo in raking light, not flat light.
Price context
Replica sellers ask $250 to $700 for this class of watch. A genuine IW329071 sells used for several thousand dollars. Treat a "new in box, full set" offer far below market as a fake or as stolen goods. Ask for the warranty card, the box label and any service invoice.
Checks before you buy
- Weigh the watch on a scale. IWC steel dive watches sit in a narrow gram range for each bracelet type.
- Ask for a 10-second video of the seconds hand and one full bezel turn.
- Ask for a caseback photo in raking light and a straight-on dial photo.
- Ask the seller to state the serial and the reference as engraved, then check both against the paperwork.
Limits of a photo check
Photos settle the dial and caseback questions. They do not settle the movement. A replica with a genuine dial and a swapped movement passes a photo check. For any purchase above a few hundred dollars, pay a watchmaker who handles IWC to inspect the watch. Add that cost to the price before you decide.